Jojoba Oil
Also known as: Simmondsia Chinensis Seed Oil
Description
Jojoba oil is a liquid wax ester extracted from the seeds of the jojoba shrub (Simmondsia chinensis), native to the Sonoran Desert. Unlike conventional plant oils (triglycerides), jojoba oil is composed of long-chain monounsaturated wax esters (primarily C20:1 and C22:1) that structurally resemble the wax esters found in human sebum (~25% of sebum composition). This structural similarity accounts for its excellent skin compatibility, rapid absorption, and non-comedogenic profile (comedogenicity rating 2). Jojoba oil also contains tocopherols (vitamin E) and squalene providing antioxidant activity. Its unique molecular structure allows it to form a thin, non-greasy protective film that mimics and supplements the skin's natural lipid barrier without occluding pores.
Mechanism of Action
Jojoba wax esters integrate into the skin's lipid matrix due to their structural homology with endogenous sebum wax esters. The linear C20–C22 monounsaturated wax esters fill gaps in the intercellular lipid lamellae of the stratum corneum, improving barrier cohesion and reducing transepidermal water loss (TEWL). Because jojoba oil mimics sebum, it may help regulate sebum production through a negative feedback mechanism — when the skin surface is adequately coated with wax esters, sebaceous glands may reduce output. Non-comedogenicity is attributed to the wax ester structure (vs. triglycerides), which is not a preferred substrate for Cutibacterium acnes lipases. Gadoleic acid (C20:1) provides anti-inflammatory effects, and natural tocopherols prevent lipid peroxidation in the skin surface lipids.
Indications
- Dry skin / xerosis
- Acne-prone skin (non-comedogenic emollient)
- Atopic dermatitis (barrier support)
- Sensitive skin care
- Sebum regulation
- Makeup removal / cleansing
- Hair and scalp conditioning
Available Concentrations
Side Effects
- Generally very well tolerated
- Rare contact dermatitis or allergic reaction
- May feel occlusive on very oily skin at high concentrations
- Potential for adulteration with cheaper oils (purity-dependent)
Contraindications
- Known hypersensitivity to Simmondsia chinensis seed oil
- Not for oral ingestion (contains simmondsin, a toxic appetite suppressant)
Pregnancy Category
Not classified (considered safe for topical use)